Now we'd like to continue a civil conversation on this important issue. Please use the prompts below as conversational sparks, and share your reactions in the Comments. As always, we love to hear from you.

Science writer and author Matt Ridley discusses climate change with EconTalk host Russ Roberts. Based on his reading of the scientific evidence, Ridley describes himself as a "lukewarmer." While Ridley agrees that humans have made the climate warmer, he argues that the impact is small or positive over some temperature ranges and regions. He rejects the catastrophic scenarios that some say are sufficiently likely to justify dramatic policy responses, and he reflects on the challenges of staking out an unpopular position on a contentious policy issue.

Morten Jerven of Simon Frasier University talks with EconTalk host Russ Roberts about his new book, Africa: Why Economists Get It Wrong. Jerven, who will be joining Noragric at the Norwegian University of Life Sciences this fall, argues that economists have misread the economic history of Africa, ignoring successful episodes of economic growth while trying to explain a perpetual malaise that does not exist. Jerven is critical of many of the attempts to explain growth using econometric techniques and suggests that a richer approach is necessary that is aware of the particular circumstances facing poor countries.

What's it like to hang out with Brad Pitt, Christian Bale, Ryan Gosling, and Steve Carell for two months? Adam Davidson, who writes for the New York Times Sunday Magazine, was the technical advisor to the upcoming movie, The Big Short. Besides rubbing shoulders with celebrities, he noticed what he calls the Hollywood model where highly talented workers come together temporarily in project-based employment. Davidson discusses the costs and benefits of this approach and its potential emergence as a more common phenomenon throughout the economy.

Nathaniel Popper of the New York Times and the author of Digital Gold talks with EconTalk host Russ Roberts about Bitcoin. Can Bitcoin make it? What went wrong with Mt. Gox? Why did Ross Ulbricht, the creator of Silk Road, just get sentenced to life in prison? Why are venture capital firms pouring millions of dollars into companies promising easier ways to use Bitcoin? Popper discusses these questions along with the technical side of Bitcoin to help listeners understand why so many investors are excited about the potential of Bitcoin.

Is climate change the ultimate Black Swan? Martin Weitzman of Harvard University and co-author of Climate Shock talks with EconTalk host Russ Roberts about the risks of climate change. Weitzman argues that climate change is a fat-tailed phenomenon--there is a non-trivial risk of a catastrophe. Though Weitzman concedes that our knowledge of the climate is quite incomplete, he suggests that it is prudent to take serious measures, including possibly geo-engineering, to reduce the accumulation of carbon dioxide in the atmosphere.

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